“He is within all and outside all” - This quote comes from the Isa Upanishad 1.5 (TOPIC - Brahman)
“All that we see in this world is Brahman” - This quote comes from the Chandogya Upanishad 3.14 (TOPIC - Brahman)
“He who inhabits the mind … controls the mind from within” - This quote comes from the Brihadaranyaka Upanishad 3.7 (TOPIC - The Divine)
“Brahma was … the creator of all … From him comes all life” - This quote comes from the Mundaka Upanishad 1 and 2 (TOPIC - The tri-murti - Brahma)
“You are the infinite; the universe is also infinite” - This quote comes from the Ishawashya Upanishad (TOPIC - The tri-murti - Brahma)
“Whenever there appears on earth decline of Righteousness … I send myself to Birth” - This quote comes from the Bhagavad Gita 4.7 - 8 (The tri-murti - Vishnu)
“Of all the types of worship, worship of Vishnu is supreme” - This quote comes from the Padma Purana (TOPIC - The tri-murti - Vishnu)
“He watches over all beings and rules over their creation and destruction” - This quote comes from the Svetasvatara Upanishad 3 (TOPIC - The tri-murti - Shiva)
“One day of Brahma lasts a thousand cycles of the four ages” - This quote comes from the Bhagavad Gita 8.17 (TOPIC - Hindu Cosmology)
The Rig Veda is full of cosmological theories e.g. time is cyclical, the world is repeatedly created, there are 3 tiers of our universe etc